CNODE to Model Displacements?
CNODE to Model Displacements?
(OP)
Hello all,
I want to model an existing pipe in a piperack and use CNODES to impart a 3" vertical upward deflection to simulate lifting a portion of the pipe with come-alongs. There are no thermal stresses being considered, just trying to see what stresses are induced by lifting a portion of the pipe to make some repairs. The geometry at the point of consideration is a 4" teeing into an 8" which also has a 12" branch. I need to lift the 4" portion of the line 3 inches and want to make sure I do not overstress any portion of the line(s). My question: Is CNODES the best way to model this 3" vertical displacement? If not, please suggest alternatives.
Thanks in advance,
I want to model an existing pipe in a piperack and use CNODES to impart a 3" vertical upward deflection to simulate lifting a portion of the pipe with come-alongs. There are no thermal stresses being considered, just trying to see what stresses are induced by lifting a portion of the pipe to make some repairs. The geometry at the point of consideration is a 4" teeing into an 8" which also has a 12" branch. I need to lift the 4" portion of the line 3 inches and want to make sure I do not overstress any portion of the line(s). My question: Is CNODES the best way to model this 3" vertical displacement? If not, please suggest alternatives.
Thanks in advance,





RE: CNODE to Model Displacements?
Richard Ay
Intergraph CAS
RE: CNODE to Model Displacements?
RE: CNODE to Model Displacements?
DSB123 - yeah I knew someone would have a problem with the wording of my post. Remember, I am a structural guy not a pipe guy. There is a reducing tee which connects the 4" to the 8" which explains the 4" line. There is also another tee which is an 8"x8"x8"; however, the branch portion I was talking about is further downstream where the 8" swedges up to a 12"...I was (incorrectly) calling that a 12" branch.
RE: CNODE to Model Displacements?
- check the checkbox for "imposed displacements"
- in the resulting dialog, specify the node number and the magnitude of the desired displacement in the appropriate DOFs.
- later, when setting up load cases, apply the defined displacement vector in the desired load cases.
Richard Ay
Intergraph CAS